SwiftLint config error on carthage build

[toshi0383]

On carthage build or carthage update , this library currently emits swiftlint config errors.

$ carthage build --platform tvos SwiftState
*** xcodebuild output can be found in /var/folders/tr/3lftss053tqdh731cgt0w1p00000gn/T/carthage-xcodebuild.eJzwNs.log
*** Building scheme "SwiftState" in SwiftState.xcodeproj
2016-03-05 01:41:43.498 xcodebuild[19404:463121] ### Failed to load Addressbook class CNContactNameFormatter
2016-03-05 01:41:48.926 xcodebuild[19466:463272] ### Failed to load Addressbook class CNContactNameFormatter
configuration error: 'variable_name_min_length' is not a valid rule identifier
configuration error: 'variable_name_min_length' is not a valid rule identifier

IMO, a library should not be running SwiftLint in its Build Phase.

[inamiy]

Thanks for issue! I fixed it in #46.

[toshi0383]

🚀